Selectivity of ethoxysulfuron to soybean and common bean

Abstract

The emergence of soybean seeds in fields during the common bean cultivation can negatively affect the growth and yield of this crop. This problem can be minimized with the use of selective herbicides to common bean but non-selective to soybean. Aiming to define management strategies to voluntary soybean plants in the common beans crop, this research was carried out to evaluate the selectivity of ethoxysulfuron to soybean and common beans crops. Two experiments were conducted in a greenhouse, in randomized block design with four replications. Each experiment corresponded to a crop: soybean or common bean. Treatments were arranged in factorial arrangement 2x9, where the first factor corresponds to herbicide application single or in tank mixture with mineral oil Nimbus^® at 0.5% v/v and the second was related to ethoxysulfuron doses (0, 1.8, 3.6, 5.4, 7.2, 9.0, 13.5, 18 and 36 g a.i. ha^-1). At 7, 14, 21, and 28 days after application (DAA) was evaluated the visual intoxication, and at 35 DAA the leaf area and total plant dry matter. The ethoxysulfuron caused low intoxication to common bean plants, without interfering in leaf area and total plant dry matter. Soybean was sensitive to this herbicide, especially in higher doses and in the presence of mineral oil. The dose of 36 g a.i. ha^-1 of ethoxysulfuron plus mineral oil caused the death of soybean plants without interfere in growing of common bean crop.